package jalview.appletgui;

import jalview.datamodel.*;
import java.awt.*;
import java.awt.event.*;

public class ScalePanel extends Panel
{

  protected int offy = 4;
  public    int width;

  protected AlignViewport av;
  AlignmentPanel ap;

  boolean stretchingGroup = false;

  public ScalePanel(AlignViewport av, AlignmentPanel ap)
  {
    setLayout(null);
    this.av         = av;
    this.ap = ap;

    addMouseListener(new MouseAdapter()
    {
      public void mousePressed(MouseEvent evt)
      {
        doMousePressed(evt);
      }
      public void mouseReleased(MouseEvent evt)
      {
        doMouseReleased(evt);
      }

    });
    addMouseMotionListener(new MouseMotionAdapter()
    {
      public void mouseDragged(MouseEvent evt)
      {
        doMouseDragged(evt);
      }
    });

  }


  public void doMousePressed(MouseEvent evt) {
    int x = evt.getX();
    int res = x/av.getCharWidth() + av.getStartRes();
    SequenceGroup sg = null;

    if (av.getColumnSelection().contains(res))
      av.getColumnSelection().removeElement(res);
    else
    {
      av.getColumnSelection().addElement(res);

      sg = new SequenceGroup();
      for (int i = 0; i < av.alignment.getSequences().size(); i++)
        sg.addSequence(av.alignment.getSequenceAt(i));

      sg.setStartRes(res);
      sg.setEndRes(res);

      ap.annotationPanel.addEditableColumn(res);
    }
    av.setSelectionGroup(sg);
    ap.repaint();
  }

  public void doMouseReleased(MouseEvent evt)
  {
    if(!stretchingGroup)
      return;

    int x = evt.getX();
    int res = x/av.getCharWidth() + av.getStartRes();

   if (! av.getColumnSelection().contains(res))
     av.getColumnSelection().addElement(res);

   SequenceGroup sg = av.getSelectionGroup();

   if(res>sg.getStartRes())
     sg.setEndRes(res);
   else if(res<sg.getStartRes())
     sg.setStartRes(res);

   stretchingGroup = false;
   ap.repaint();
  }

  public void doMouseDragged(MouseEvent evt)
  {
    int x = evt.getX();
    int res = x/av.getCharWidth() + av.getStartRes();

    SequenceGroup sg = av.getSelectionGroup();
    if(sg!=null)
    {
      stretchingGroup = true;
      if (res > sg.getStartRes())
        sg.setEndRes(res);
      else if (res < sg.getStartRes())
        sg.setStartRes(res);

       ap.annotationPanel.addEditableColumn(res);
      ap.repaint();
    }
  }

  public void update(Graphics g)
  {
    paint(g);
  }

  public void paint(Graphics g)
  {
    drawScale(g, av.getStartRes(), av.getEndRes(), getSize().width, getSize().height);
  }

// scalewidth will normally be screenwidth,
  public void drawScale(Graphics gg, int startx, int endx, int width, int height)
  {
    gg.setFont(av.getFont());

    //Fill in the background
    gg.setColor(Color.white);
    gg.fillRect(0,0,width, height);
    gg.setColor(Color.black);


    //Fill the selected columns
    ColumnSelection cs = av.getColumnSelection();
    gg.setColor(new Color(220,0,0));
    for (int i=0; i<cs.size(); i++)
    {
      int sel  = cs.columnAt(i);
      if ( sel >= startx  && sel <= endx)
        gg.fillRect((sel-startx)*av.charWidth,0,av.charWidth, getSize().height);
    }


    // Draw the scale numbers
    gg.setColor(Color.black);
    int scalestartx = (startx/10) * 10;

    FontMetrics fm = gg.getFontMetrics(av.getFont());
    int y = av.charHeight -fm.getDescent();

    if(scalestartx%10==0)
      scalestartx+=5;

    for (int i=scalestartx;i < endx; i+= 5)
    {
      if(i%10==0)
      {
        gg.drawString(String.valueOf(i), (i - startx - 1) * av.charWidth, y);
        gg.drawLine( (int) ( (i - startx - 1) * av.charWidth + av.charWidth / 2),
                    y+2,
                    (int) ( (i - startx - 1) * av.charWidth + av.charWidth / 2),
                    y+fm.getDescent()*2);
      }
      else
        gg.drawLine( (int) ( (i - startx - 1) * av.charWidth + av.charWidth / 2),
                    y+fm.getDescent(),
                    (int) ( (i - startx - 1) * av.charWidth + av.charWidth / 2),
                   y+fm.getDescent()*2);


    }
  }


}